A platinum coated electrode, which creates a magnetic field of 25 mT and a field gradient of order 105T m-1within 100 nm of the electrode surface is produced by embedding an array of CoPt nanowires in an alumina membrane. There is an enhancement by up to a factor of three for a model oxygen reduction reaction in an alkaline medium when the nanowires in the electrode are in a magnetized state. We suggest that the enhancement of the oxygen reduction current is associated with an increase of concentration of HO2-on the surface of the electrode by the magnetic field gradient. © 2006 Elsevier B.V. All rights reserved.
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